The LISST-100 instrument is a
multi-parameter system for in-situ observations of particle
size distribution. It also records the optical transmission,
pressure and temperature. The instrument is fully
self-contained with battery and data-logger. It can be used
with supplied programs, or in specially designed modes, e.g.
event triggered based on storms (pressure variance) or fronts
(temperature front). Two size-ranges are available: 1.25-250
microns (Type-B) and 2.5-500 microns (Type-C). Standard memory
size is 512KB, suitable for storing approximately 6,000 size
distributions, with option to expand to 2MB, or 26,000 size
distributions. Special versions are available for deep-ocean,
high-concentration, or low-concentration environments. At the
heart of the instrument is a collimated laser diode and a
specially constructed annular ring detector (see Application
Note L001). Scattering at 32 angles is the primary information
that is recorded. This primary measurement is mathematically
inverted to get the size distribution, and also scaled to
obtain the volume scattering function (VSF), see Application
Note L002. The size distribution is presented as concentration
(micro-l/l) in each of 32 log-spaced size bins. Optical
transmission, water depth and temperature are recorded as
supporting measurements.
An auxiliary salinity sensor is available as
an option to obtain full CTD capability, see Application Note
L003. Designed for extended field application, the LISST-100
is a self-contained battery-powered instrument that can be
deployed on a tripod, used in a profiling mode, towed, or
moored. Many custom versions of the instruments have been
built, including for deep-sea applications. Custom inquiries
are welcome.
For more information about the LISST-100
contact:
Sequoia Scientific, Inc.
Westpark Technical
Center
15317 NE 90th Street
Redmond, WA 98052
Phone:
(425) 867-2464
Fax: (425) 867-5506
Email: lisst@sequoiasci.com
Copyright 1999, Sequoia Scientific,
Inc.
Westpark Technical Center, 15317 NE 90th Street,
Redmond, WA 98052
Phone: (425) 867-2464, Fax: (425)
867-5506, Email: info@sequoiasci.com
